KR20150052594A

KR20150052594A - Simulation apparatus for removing scale of strip

Info

Publication number: KR20150052594A
Application number: KR1020130134219A
Authority: KR
Inventors: 김동훈; 탁영준
Original assignee: 주식회사 포스코
Priority date: 2013-11-06
Filing date: 2013-11-06
Publication date: 2015-05-14

Abstract

The present invention provides a simulator for descaling the surface of a thick plate to precisely represent conditions close to an actual work condition in order to grasp problems that can be caused in the actual work of a grinder for descaling the surface of a thick plate. To achieve this, the simulator for descaling the surface of a thick plate comprises: an elevation table installed on a worktable to be moved up and down; a mount installed on the elevation table to be laid with specimens; grinding stone positioned above the mount to adhere to a specimen; a spindle motor to rotate the grinding stone; a driving cylinder for moving the elevation table up and down to pressurize a specimen into the grinding stone; a load cell connected to the driving cylinder to detect grinding pressure applied to a specimen; and a control part connected to the load cell and the spindle motor to make data on the rotation of the spindle motor and the grinding pressure applied to it, in accordance with the detection value of the load cell.

Description

Technical Field [0001] The present invention relates to a surface scaling apparatus,

The present invention relates to a simulation apparatus for removing scale on a surface of a thick plate. More particularly, the present invention relates to an apparatus for simulating a heavy plate surface scaling removal method for simulating a method of removing scale of a heavy plate surface using polishing.

Generally, a rolled steel plate is covered with a scale that is an oxide. These scales can be removed through a scale removal process as they cause surface scratches and the like of the product.

The scale removal process for the thick plate is performed by a shot ball blaster which projects the iron ball on the surface of the thick plate and separates the scale layer, and then the surface scale is removed through the chemical pickling process. The chemical pickling process removes the scale through sulfuric acid deposition, mixed acid deposition consisting of nitric acid and hydrofluoric acid.

However, the scale removal work through the chemical pickling process has a problem in that the waste acid liquid treatment cost is increased, and the surface roughness of the thick plate after the pickling process is deteriorated, and there is a problem that the surface needs to be polished again.

Recently, many researches have been conducted to develop a process capable of removing the scale of a heavy plate through surface polishing without going through a chemical pickling process.

In order to properly carry out the surface scaling process through such polishing, it is necessary to derive the optimum polishing conditions so as to completely improve the problems occurring in the chemical pickling process. In addition, it is required to secure accurate data on how scaling is performed according to the polishing conditions at the time of actual scale removal.

The present invention provides an apparatus for simulating a surface scraping removal of a heavy plate so as to accurately reproduce a situation close to an actual operation so as to grasp a problem that may occur in actual operation of a surface scraping removal apparatus for a heavy plate.

Also provided is a scraping test apparatus for scraping surface under various conditions, and capable of accurately confirming the result.

The experimental apparatus is composed of a platform, a platform installed on the platform and a specimen placed on the platform, a grinding stone placed on the specimen, and a spindle motor for rotating the grinding stone. A driving cylinder connected to the driving cylinder and connected to the load cell and the spindle motor for detecting a polishing pressure according to a detection value of the load cell and a spindle motor connected to the spindle motor, And a controller for receiving the rotation value of the motor and converting the data into data.

The experimental apparatus may further include an electrolytic polishing test section for testing electrolytic polishing by applying a current to the test piece during polishing of the test piece.

Wherein the electrolytic polishing test unit includes a container mounted on a platform for mounting a holder and filled with an electrolytic solution, an electrode provided in the electrolytic solution of the container, and a current applying unit connected to the electrode to apply a current to the electrolytic solution, The control unit can digitize the current value applied to the electrode through the current application unit.

The experimental apparatus may further include a guide bar installed at each corner of the platform, and a guide holder installed on the work platform and guided by the guide bar, so as to be supported and guided when vertically moving.

The cover may further include a cover provided at an upper end of the container, wherein the cover has a through hole through which the grinding stone moves in the center, and the electrode is fixedly installed on one side.

As described above, according to the present embodiment, it is possible to precisely check the situation occurring during the surface scraping operation of the heavy plate through polishing through the simulator, and it is possible to more accurately predict the scale removal situation in actual operation.

Also, it is possible to find the optimum polishing condition for removing scale by using the simulator, and it is possible to provide the optimum operating condition to the actual scale removing apparatus by using the optimum result obtained through this.

In addition, through the results obtained through the simulation apparatus, the scale is removed through the actual polishing process, thereby solving the problems caused by the pickling process in the past, and finally producing the high value-added steel with excellent surface quality.

1 is a schematic cross-sectional view showing a heavy plate surface scaling removal simulator according to the present embodiment.
Fig. 2 is a schematic view for explaining the operation of the thick plate surface scaling removal simulator according to the present embodiment.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings so that those skilled in the art can easily carry out the present invention. It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Wherever possible, the same or similar parts are denoted using the same reference numerals in the drawings.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the invention. The singular forms as used herein include plural forms as long as the phrases do not expressly express the opposite meaning thereto. Means that a particular feature, region, integer, step, operation, element and / or component is specified, and that other specific features, regions, integers, steps, operations, elements, components, and / And the like.

All terms including technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the art to which the present invention belongs. Predefined terms are further interpreted as having a meaning consistent with the relevant technical literature and the present disclosure, and are not to be construed as ideal or very formal meanings unless defined otherwise.

FIG. 1 is a schematic cross-sectional view illustrating a heavy plate surface scale removal simulation apparatus according to an embodiment of the present invention, and FIG. 2 is a schematic view illustrating operation of a heavy plate surface scale removal simulation apparatus according to the present embodiment.

As shown in FIG. 1, the simulated test apparatus 100 performs an experiment to remove scale by polishing the specimen P, and in this process, the experimental conditions applied to the specimen P during the experiment are confirmed, .

To this end, the simulator apparatus 100 of the present embodiment includes a platform 20 mounted on a work platform 10 so as to be vertically movable up and down, a platform 22 installed on the platform 20, A spindle motor 32 for rotating the grinding stone 30 and a lifting table 20 for lifting the platform 20 so as to move the specimen P A load cell 26 connected to the drive cylinder 24 for detecting a polishing pressure applied to the specimen P and a load cell 26 connected to the load cell 26 and the spindle motor And a control unit 50 connected to the load cell 26 for receiving the polishing pressure according to the detected value of the load cell 26 and the rotation value of the spindle motor 32 and converting the received data into data.

The abrasive structure of the specimen P in this apparatus simulates a device for abrading an actual plate to remove scale. The size of the apparatus is not particularly limited as long as it can sufficiently simulate the actual descale apparatus.

At the lower end of the work table 10, support legs 12 for aligning the work table 10 in a horizontal state are provided at four corners. An upper frame 14 is extended to the upper end of the work table 10 and a spindle motor 32 is mounted on the frame 14 to be coupled to the work table 10.

A platform 20 is located at the upper end of the work table 10 and a drive cylinder 24 is installed between the work table 10 and the platform 20 to move the platform 20 up and down with respect to the work table 10 . The driving cylinder (24) is disposed at the center of the platform (20).

A guide bar 16 is vertically installed at each corner of the platform 20 toward the work table 10 and a guide holder 16 is slidably inserted and guided on the work table 10, ) 18_ are installed. Accordingly, the guide bar 16 is guided along the guide holder 18 during the expansion and contraction operation of the drive cylinder 24, so that the platform 20 can be moved up and down while keeping the horizontal state stably.

A pedestal 22 to which the test piece P is fixed is installed at the center of the upper end of the platform 20.

The grinding stone 30 provided on the rotating shaft of the spindle motor 32 is positioned just above the holder 22.

When the spindle motor 32 is driven to rotate the grinding stone 30 and the lift cylinder 20 is moved upward by the extension operation of the drive cylinder 24, the specimen P placed on the holder 22 A scale removing operation by polishing is performed while being pressed by the grinding stone 30. [

The polishing pressure of the grinding stone 30 relative to the test piece P varies depending on the amount of elongation and contraction of the driving cylinder 24. A load cell 26 for detecting a polishing pressure is provided between the driving cylinder 24 and the platform 20. The pressure applied between the grindstone 30 and the specimen P is transmitted to the load cell 26 through the platform 20 as the platform 20 ascends and descends. Thus, the load cell 26 can detect the polishing pressure for the test piece P. The load cell 26 and the spindle motor 32 are connected to the control unit 50 so that the control unit 50 converts the polishing pressure detected by the load cell 26 and the rotation value of the spindle motor 32 into data.

On the other hand, the simulation apparatus of the present embodiment further includes an electrolytic polishing test section for testing electrolytic polishing by applying a current to the test piece P during the polishing of the test piece P. The electrolytic polishing test section is for simulating an electrolytic polishing and pickling process.

The electrolytic polishing test unit can be used to digitize the actual current value during polishing and to simulate the electrolytic polishing effect according to the change of the current value.

In the present embodiment, the electrolytic polishing test section includes a container 40 provided on the platform 20 to surround the cage 22 and filled with an electrolytic solution, an electrode 42 provided in the electrolytic solution of the container 40 And a current applying unit 44 connected to the electrode 42 to apply a current to the electrolyte.

The current application unit 44 is connected to the controller 50 so that the controller 50 converts the current value applied to the electrode 42 through the current application unit 44 into data.

The container 40 may be made of a transparent material. The height of the upper end of the test piece P is sufficiently larger than that of the test piece P so that the test piece P can be immersed in the electrolyte solution. The lower end of the container 40 is closely attached to the upper end of the platform 20, and the upper end of the container 40 is opened. An inlet for injecting an electrolyte (NaNO 3) may be provided on one side of the vessel 40.

In addition, the electrolytic polishing test section further includes a cover 46 installed at the top of the container 40. The cover 46 has a through hole 48 through which the grinding stone 30 is moved in the center, and the electrode 42 is fixed to one side of the cover 46.

The electrode 42 is fixed to the cover 46 so that the upper end thereof is electrically connected to the current applying part 44 and the lower end thereof is extended into the container 40 to be contained in the electrolyte solution.

The control unit 50 is connected to the load cell 26, the spindle motor 32 and the current applying unit 44 so that the polishing pressure detected by the load cell 26 and the rotation value of the spindle motor 32 And the current application unit 44. The current value applied through the current application unit 44 is data. The rotation value of the spindle motor 32 can be confirmed by the output signal applied to the spindle motor 32 at the rotation speed of the grinding stone 30.

The control unit 50 is connected to an operation panel 52 for setting each driving unit of the apparatus to a desired value. It is possible to operate the apparatus by setting the expansion and contraction amount of the drive cylinder 24, the rotation value of the spindle motor 32 and the current value applied to the electrode 42 to a desired value through the operation panel 52. The control unit 50 controls the drive cylinder 24, the spindle motor 32 and the current application unit 44 to operate the apparatus according to the value set on the operation panel 52. At this time, The abrasive polishing conditions are data obtained by the control unit 50.

Therefore, the control unit 50 can confirm the data according to the polishing pressure at the time of polishing the specimen P, the amount of grinding stone rotation, the current value applied to the specimen, etc., and derive the most appropriate scale removal condition based on this data.

Hereinafter, the operation of the apparatus will be described with reference to FIGS. 1 and 2. FIG.

The operator simulates and implements the scale removal result obtained according to the polishing condition at the time of operation in the actual scale polishing apparatus through the simulator apparatus 100, thereby obtaining an optimal scale removal condition.

First, the prepared specimen P is mounted on the cradle 22 and the driving cylinder 24 is extended to bring the specimen P into close contact with the abrasive stone 30. When the drive cylinder 24 is extended, the platform 20 is lifted up and the specimen P placed on the platform 22 abuts against the grinding stone 30. When the specimen P comes into contact with the grinding stone 30, the electrolytic solution is injected into the vessel 40. An electrode 42 is provided on the cover 46 and each electrode 42 is electrically connected to the current applying unit 44.

When the preparatory work is completed in this way, a desired polishing pressure and a polishing speed value are inputted through the operation panel 52 of the control unit 50 and polishing is started. When the simulation is started, the drive cylinder 24 is extended according to the set pressure value to press the specimen P to the grinding stone 30. [ At this time, the pressing force of the test piece P pressed by the grinding stone 30 is detected by the load cell 26 and applied to the control unit 50. The control unit 50 can control the drive cylinder 24 from the value detected by the load cell 26 to apply the correct polishing load to the specimen P. [ The detected value of the load cell 26 is stored in the control unit 50 as data on the polishing pressure value. Further, the spindle motor 32 rotates the grinding stone 30 according to the set polishing speed value. The grinding stone 30 is rotated in accordance with the driving of the spindle motor 32 to remove the scale on the surface of the specimen P. [

After polishing the specimen P, the control unit 50 operates the current applying unit 44 to apply a current to the electrode 42 according to the set current value. The current applied to the electrode 42 is applied to the specimen P through the electrolytic solution.

Electrolytic polishing is performed on the specimen P, so that the rough surface of the polished surface of the abrasive stone 30 is softened and the surface roughness is improved. In addition, in the test piece P, the effect of improving the oxidation resistance and the corrosion resistance is increased by the passive film formation by the electrolytic solution, and the electrolytic polishing and pickling quality with excellent surface is obtained.

Upon completion of the scale removal test on the specimen P, the surface roughness of the specimen P is inspected to obtain the test results of the polishing pressure, the polishing speed, and the applied current data recorded in the controller 50. Through these simulations, it is possible to derive the optimum scale removal condition according to the polishing pressure, the polishing speed and the applied current, and to simulate the electrolytic polishing effect according to the change in the amount of current.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, Of course.

10: work platform 20: platform
22: Cradle 24: Drive cylinder
26: load cell 30: grindstone
32: spindle motor 40: container
42: electrode 44: current applying portion
46: Cover 50:
52: Operation panel

Claims

A spindle motor for rotating the grindstone; a spindle motor for rotating the grindstone; and a spindle motor for rotating the grindstone. The spindle motor is mounted on the platform, A load cell connected to the drive cylinder and detecting a polishing pressure applied to the specimen; a pressure sensor connected to the load cell and the spindle motor for detecting a polishing pressure according to a detection value of the load cell and a rotation value of the spindle motor And a controller for receiving the data and converting the data into data.

The method according to claim 1,
Further comprising a guide bar installed at each corner of the platform, and a guide holder installed on the work platform and guided by the guide bar.

3. The method according to claim 1 or 2,
And an electrolytic polishing test unit for testing electrolytic polishing by applying current to the specimen during polishing of the specimen.

The method of claim 3,
Wherein the electrolytic polishing test unit includes a container mounted on a platform for mounting a holder and filled with an electrolytic solution, an electrode provided in the electrolytic solution of the container, and a current applying unit connected to the electrode to apply a current to the electrolytic solution, And the control unit converts the current value applied to the electrode through the current application unit into data.

5. The method of claim 4,
Wherein the cover further includes a cover provided at an upper end of the container, wherein the cover has a through hole through which the grinding stone moves, and the electrode is fixed to one side of the cover.